import java.util.HashMap;

public class TestA {
    public static void main(String[] args)  {
        HashMap<String,Integer> map = new HashMap<>();
        map.put("a",0);
        Integer a = map.get("a");
        String s ="123456";
        char[] charArray = s.toCharArray();
        System.out.println(charArray);
        System.out.println(a);
    }


}
